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Pennsylvania Water Quality
812
Utilities in database
11.3M
Residents served
30%
On private wells
3
Key contaminants tracked
Drinking Water in Pennsylvania
Pennsylvania has 812 community water systems serving approximately 11.3 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead, nitrates. 30% of Pennsylvania residents rely on private wells. DEP holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Pennsylvania
676–700 of 812Buck Hill Falls Water Co
PA2450020 · 876 served
Conneaut Lake Borough Wtp
PA6200015 · 870 served
Mcalisterville Area Joint Auth
PA4340002 · 850 served
Delaware Water Gap Boro
PA2450022 · 850 served
Aiken Water Company
PA6420010 · 850 served
Carrolltown Boro Muni Auth
PA4110004 · 850 served
Eldred Borough Water Auth
PA6420016 · 850 served
Conneautville Boro Water Dept
PA6200019 · 850 served
Landis Homes
PA7360071 · 850 served
Pleasantville Borough Water
PA6610025 · 846 served
Mcclure Municipal Authority
PA4550015 · 845 served
Virginia Hills Pa Llc
PA5020083 · 843 served
Aqua Pa Clarendon
PA6620021 · 840 served
Borough of Wampum Water Dept
PA6370032 · 832 served
Lcwsa Limestone Water
PA4410180 · 825 served
Ringtown Boro Water Department
PA3540039 · 823 served
Donegal Township
PA5630068 · 820 served
Alexandria Boro Water Auth
PA4310021 · 815 served
Aqua Pa Upper Providence
PA1460015 · 810 served
Spring Twp Municipal Authority
PA4550011 · 805 served
Fishertown Water Assn
PA4050029 · 801 served
Aqua Pa Paupackan Lake Estates
PA2640048 · 800 served
Lakeshore Water Assn
PA6250039 · 800 served
Wood Broad Top Wells Jmun Auth
PA4310032 · 800 served
Possum Valley Muni Auth
PA7010034 · 800 served
Key Contaminant Concerns in Pennsylvania
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
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Data source: Utility data from EPA SDWIS. 812 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18